Danfoss VLT Automation VT Drive FC 322 Programming Manual page 249

VLT Automation VT Drive FC322
Programming Guide
NB!
If the set-point is reached after staging before the variable speed pump reaches its minimum speed - the system will enter the state closed loop as
soon as the feedback pressure is crossing the set-point.
25-43 Destaging Threshold
Range:
Application [Application dependant]
dependent*
NB!
If the set-point is reached after staging before the variable speed pump reaches its maximum speed - the system will enter the state closed loop as
soon as the feedback pressure is crossing the set-point.
25-44 Staging Speed [RPM]
Range:
0 RPM* [0 - 0 RPM]
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Function:
Function:
Readout of the below calculated value for Staging Speed When adding a fixed speed pump, in order
to prevent an overshoot of pressure, the variable speed pump ramps down to a lower speed. When
the variable speed pump reaches the "Staging Speed" the fixed speed pump is staged on. Staging
Speed calculation is based on par. 25-42
[RPM] .
Staging Speed is calculated with the following formula:
STAGE
%
=
100
STAGE HIGH
where n is Motor Speed High Limit and n
HIGH
MG.20.W1.22 - VLT is a registered Danfoss trademark
2 Parameter Description
Staging Threshold Motor Speed High Limit
, and par. 4-13
is the value of Staging Threshold.
STAGE100%
2
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